When both reactants and catalyst are present in the same phase then it is known as a homogeneous catalyst.
Catalysts help in increasing the rate of a chemical reaction without itself getting consumed as catalysts lowers the activation energy path. Therefore, molecules with less energy can also effectively take part in the reaction.
Catalysts also help in carrying out various biological reactions.
Thus, we can conclude that the phrase present in many biological reactions describes a homogeneous catalyst.
The phrase that best describes a homogeneous catalyst is : A. Present in many biological reactions since in a homogeneous catalyst the catalyst is in the same phase as the reactant, it applies in both gas and solid phase
